Sleep cool and comfortable with the Little Sleepery 5-Inch Full Memory Foam Mattress. Designed exclusively for Max & Lily bunks, lofts, and beds, this Little Sleepery mattress is the perfect fit for growing sleepers and their setups. Innovative four-layer design combines superior breathability with the plush feel and medium-firm support perfect for younger ages. Little Sleepery’s compact comfort construction provides all the comfort of a 10-inch full mattress without the bulk, maximizing headroom and ensuring guard rail security on bunks and loft beds. The top layer of Comfort Cushion Memory Foam provides a delicate, sink-in feel without sagging. The memory foam layer cradles your body and conforms to your sleeping position, reducing motion throughout the night. The Comfort Support layer provides the perfect balance between plush and firm. The high-density Hero Layer improves sleep posture while eliminating the need for a box spring or Bunkie board. A layer of Dynamic Support Base Foam provides extra durability and structure to the full-size mattress. The breathable mattress cover is made with an anti-microbial cotton for a plush, soft feel and to keep your sleeping space cleaner and fresher for longer. Anti-microbial cotton blend also provides the mattress liner a safe, fire-retardant design without the use of fiberglass and chemicals. This CertiPUR-US certified, hypoallergenic kids full mattress is made with non-toxic, eco-friendly materials and is low VOC, contributing to a clean and healthy sleeping space in your home. This mattress in a box comes compressed and rolled for an easy setup. We recommend letting the 5-inch full mattress air out and reshape for 24 hours before use. This Little Sleepery kids' mattress is designed to work perfectly with Max & Lily bunks, lofts, and beds – providing enhanced breathability and longevity when paired with wood slats. We cannot guarantee this full size mattress will fit trundle beds from other brands.